單項(xiàng)選擇題

Cracking of a diesel piston crown can result from（）

A.Excessive piston to liner clearance
B.The underside of the piston crown being excessively dirty lowering the rate of heat transfer
C.Faulty nozzle spray
D.All of the above

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單項(xiàng)選擇題

In an auxiliary diesel engine, the reason for knurling the piston skirt is to（）

A.improve skirt lubrication
B.allow for expansion
C.transmit forces evenly
D.improve the piston seal

單項(xiàng)選擇題

Which of the listed design features is found in an exhaust valve and NOT in an intake valve?（）

A.Hard alloy steel construction
B.Beveled edges on the valve head
C.Low alloy steel construction
D.Poppet type design